@unpublished{repository56135,
           title = {Prak proto 4C},
            note = {Unpublished},
       publisher = {Universitas Muhammadiyah Prof. DR. HAMKA},
             url = {http://repository.uhamka.ac.id/id/eprint/56135/},
          author = {Nikmatullah, Nurul Azmah}
}